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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | /* * fs/nfsctl.c * * This should eventually move to userland. * */ #include <linux/config.h> #include <linux/types.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/syscall.h> #include <linux/linkage.h> #include <linux/namei.h> #include <linux/mount.h> #include <linux/syscalls.h> #include <asm/uaccess.h> /* * open a file on nfsd fs */ static struct file *do_open(char *name, int flags) { struct nameidata nd; int error; nd.mnt = do_kern_mount("nfsd", 0, "nfsd", NULL); if (IS_ERR(nd.mnt)) return (struct file *)nd.mnt; nd.dentry = dget(nd.mnt->mnt_root); nd.last_type = LAST_ROOT; nd.flags = 0; nd.depth = 0; error = path_walk(name, &nd); if (error) return ERR_PTR(error); if (flags == O_RDWR) error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE); else error = may_open(&nd, MAY_WRITE, FMODE_WRITE); if (!error) return dentry_open(nd.dentry, nd.mnt, flags); path_release(&nd); return ERR_PTR(error); } static struct { char *name; int wsize; int rsize; } map[] = { [NFSCTL_SVC] = { .name = ".svc", .wsize = sizeof(struct nfsctl_svc) }, [NFSCTL_ADDCLIENT] = { .name = ".add", .wsize = sizeof(struct nfsctl_client) }, [NFSCTL_DELCLIENT] = { .name = ".del", .wsize = sizeof(struct nfsctl_client) }, [NFSCTL_EXPORT] = { .name = ".export", .wsize = sizeof(struct nfsctl_export) }, [NFSCTL_UNEXPORT] = { .name = ".unexport", .wsize = sizeof(struct nfsctl_export) }, [NFSCTL_GETFD] = { .name = ".getfd", .wsize = sizeof(struct nfsctl_fdparm), .rsize = NFS_FHSIZE }, [NFSCTL_GETFS] = { .name = ".getfs", .wsize = sizeof(struct nfsctl_fsparm), .rsize = sizeof(struct knfsd_fh) }, }; long asmlinkage sys_nfsservctl(int cmd, struct nfsctl_arg __user *arg, void __user *res) { struct file *file; void __user *p = &arg->u; int version; int err; if (copy_from_user(&version, &arg->ca_version, sizeof(int))) return -EFAULT; if (version != NFSCTL_VERSION) return -EINVAL; if (cmd < 0 || cmd >= sizeof(map)/sizeof(map[0]) || !map[cmd].name) return -EINVAL; file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY); if (IS_ERR(file)) return PTR_ERR(file); err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos); if (err >= 0 && map[cmd].rsize) err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos); if (err >= 0) err = 0; fput(file); return err; } |